The velocity is $\frac{2000}{5.75}=347.826$
A can't hear. Because, he was $17$ meters away from the hill where as, to hear an echo, he had to be at least $\frac {347.826}{20}=17.39$ meters distant from the hill.
Search found 829 matches
- Sun Jan 13, 2013 9:10 am
- Forum: Secondary Level
- Topic: Physics
- Replies: 3
- Views: 3050
- Sun Jan 13, 2013 8:47 am
- Forum: Computer Science
- Topic: IDE
- Replies: 26
- Views: 33997
Re: IDE
I also use ideone.com. it's easier to save and sort.
- Sun Jan 06, 2013 8:20 pm
- Forum: Introductions
- Topic: Hello Everybody
- Replies: 3
- Views: 3812
Re: Hello Everybody
Hello everyone.I am Zadid Hasan from the town of Mymensingh,Bangladesh.I joined this forum on Oct 27,2011.My present favourite color is BLUE . :mrgreen: Btw welcome charityst021. :D :D :D Tiham,What do you mean your forum? :evil: Having post number too high doesn't make it yours. :twisted: Well, I ...
- Sun Jan 06, 2013 12:00 pm
- Forum: Combinatorics
- Topic: Probability in a football game
- Replies: 11
- Views: 8664
Re: Probability in a football game
I couldn't post my full solution because my mobile supports limited texts. And Alas! My computer is now in hospital for treatment. . . You can say it a joke. :D That's why you are posting big solutions writing 'next post....' Have you tried editing the post ? I believe when editing, mobile will not...
- Sun Jan 06, 2013 11:27 am
- Forum: Introductions
- Topic: Hello Everybody
- Replies: 3
- Views: 3812
Re: Hello Everybody
Welcome to our forum.
of course, it is now yours, too.
of course, it is now yours, too.
- Sat Jan 05, 2013 9:20 pm
- Forum: Secondary Level
- Topic: Combination Identity
- Replies: 9
- Views: 5446
Re: Combination Identity
I myself finished it like SANZEED. However, its official solution is also very charming. Let $\displaystyle S=1\cdot \binom{n}{1}+2\cdot \binom{n}{2}+...+n\cdot \binom{n}{n}$ Also $\displaystyle S=(n-1)\cdot \binom{n}{1}+(n-2)\cdot \binom{n}{2}+...+1\cdot \binom{n}{n-1}+n\binom{n}{0}$ _____________...
- Sat Jan 05, 2013 9:15 pm
- Forum: Secondary Level
- Topic: Multiple of 5
- Replies: 8
- Views: 4979
Re: Multiple of 5
The truth is that, I posted this 'post' as an observation because I could not find out a rigorous 'chopping' logic after a lot of brain cooking.*Mahi* wrote:This observation is so true that it kills the problem in just one linenafistiham wrote: don't we get $2$ in every $10$ ?
I believe, someone will do that.
- Sat Jan 05, 2013 9:04 pm
- Forum: Higher Secondary Level
- Topic: ২০১৩ এর প্রস্তুতি পর্ব (১)
- Replies: 10
- Views: 8273
Re: ২০১৩ এর প্রস্তুতি পর্ব (১)
I suggest that, any sequence depends only what is given. suppose, I give you $1$ what is next ? $2$ ? $3$ ? $4$ ? $11$ ? $10$ ? each and every has some logic behind it. Of course it is true that just $1$ can't be a sequence or series, what I want to say is any logic that satisfies what is given shou...
- Fri Jan 04, 2013 8:27 pm
- Forum: International Olympiad in Informatics (IOI)
- Topic: BdOI divisional 2013 results
- Replies: 4
- Views: 8625
Re: BdOI divisional 2013 results
Could you share the link ?*Mahi* wrote:The contestants will be informed of that in the BdIO google group.
- Fri Jan 04, 2013 8:25 pm
- Forum: International Olympiad in Informatics (IOI)
- Topic: Regional BdOI 2013 Questions
- Replies: 11
- Views: 18056
Re: Regional BdOI 2013 Questions
Nice thinking.arnob wrote:Those were all mathematical methods.... I went with a different approach
Just wrote a code which will do "xor"s .... a lot of "xor"s. As 1 and 0 in the questions gave the exact values xor gives so just returned the value of v again and again till the last.